Closing a window removes it from the screen. To close a window, select Close from the Window Menu or press the accelerator Alt F4 when the window is selected. If the window is the MainWindow of a running application, the application usually will terminate. Not all applications respond gracefully to this type of termination. Some applications may force you to perform additional steps to terminate if you close its MainWindow. If an application uses multiple independent primary windows, selecting Close may either close just that window or cause the application to exit.